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A209923 as a simple table

n a(n)
1 1
2 1
3 4
4 26
5 237
6 2778
7 39805
8 674125
9 13174189
10 291802238
11 7223963796
12 197670359937
13 5924155984714
14 192988681624915
15 6789966027406003
16 256591956638230811
17 10365414610788266136
18 445744854494435066418
19 20330276980162447348231
20 980249560154126513379574

[1,1,4,26,237,2778,39805,674125,13174189,
 291802238,7223963796,197670359937,5924155984714,
 192988681624915,6789966027406003,
 256591956638230811,10365414610788266136,
 445744854494435066418,20330276980162447348231,
 980249560154126513379574]

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Last modified April 22 22:38 EDT 2019. Contains 322380 sequences. (Running on oeis4.)